OUR SUN.

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Presentation transcript:

OUR SUN

Solar telescope

FUSION Need very high temperatures H + H → He + energy Energy= heat Light EM radiation

Compositon of the Sun 90% H & 10% He Plasma- gas stripped of electrons

Sun Layers

core Where Fusion is taking place 15 million ºC

Radiative Zone EM radiation is traveling through this zone 2.5 million ºC

CONVECTIVE ZONE Convection currents Hot gases rise to surface, cooler gases sink= turbulance

Photosphere Sun’s surface Bubbling plasma Only 6,000 ºC!

chromosphere Sun’s atmosphere 20,000 C Source of flares/prominences

chromosphere

CORONA “Crown” See only during solar eclipses 2 million C Made of ions

Journey from the center of the sun

SUNSPOTS Cool spots on sun Caused by twisting of magnetic field?

Oct. 17, 2012 Main sequence star

How long is a sunspot cycle?

11 year sunspot cycle Cycle number

Solar prominences (filaments) Follows magnetic force of sunspots Can last for weeks to a year harmless

Solar flares Violent eruption Last for minutes Can damage satellites Can reach Earth- ohoh! http://www.youtube.com/watch?v=R4fX-iFDoDY

Coronal Mass Ejections Produced in corona Large storms Can cause power outages, satellite damage and auroras

Solar wind Ions are so hot, gravity can’t hold them onto the sun 400 km/sec (1 million mph) Today: speed: 449.5 km/sec

AURORAS (Northern lights) caused when Suns’ ions enter Earth’s atm.

Auroras from space

Solar activity SpaceWeather.com http://www.youtube.com/watch?v=nmDZhQAIeXM&safety_mode=true&persist_safety_mode=1&safe=active

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